Convert //components/mus from scoped_ptr to std::unique_ptr

components/mus/ws/window_tree_host_factory.cc

Index: components/mus/ws/window_tree_host_factory.cc
diff --git a/components/mus/ws/window_tree_host_factory.cc b/components/mus/ws/window_tree_host_factory.cc
index 9e629e29b6907dfa38b13ce9e7e30e4e0d808117..c5c6cbc208b5a90beedfab24b0d81b3129012d5a 100644
--- a/components/mus/ws/window_tree_host_factory.cc
+++ b/components/mus/ws/window_tree_host_factory.cc
@@ -32,7 +32,7 @@ void WindowTreeHostFactory::CreateWindowTreeHost(
     mojom::WindowTreeHostRequest host,
     mojom::WindowTreeClientPtr tree_client) {
   Display* display = new Display(window_server_, platform_display_init_params_);
-  scoped_ptr<DisplayBindingImpl> display_binding(
+  std::unique_ptr<DisplayBindingImpl> display_binding(
       new DisplayBindingImpl(std::move(host), display, user_id_,
                              std::move(tree_client), window_server_));
   display->Init(std::move(display_binding));